package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // 1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        // 3.发送验证码
        String code = RandomUtil.randomNumbers(6);
        // 4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code, 1, TimeUnit.MINUTES);
        // 5.发送验证码
        log.debug("发送短信验证码: {}", code);
        return Result.ok();
    }


    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.1.使用手机号+验证码登录，
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        if (StringUtils.isNotBlank(loginForm.getCode())) {
            // 1.2.取出redis中的验证码与用户输入的验证码进行对比，判断验证码是否正确
            String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
            if (!loginForm.getCode().equals(cacheCode)) {
                return Result.fail("验证码错误");
            }
            // 1.3.根据手机号查询用户是否存在
            User user = this.query().eq("phone", phone).one();
            if (user == null) {
                // 1.4.用户不存在则创建
                user = this.createUserWithPhone(phone);
            }
            // 1.4.保存用户信息到redis中
            // 1.4.1.随机生成token，作为登录令牌
            String token = UUID.randomUUID().toString(true);
            // 1.4.2.将User对象转为HashMap存储
            UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
            Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                    CopyOptions.create()
                            .setIgnoreNullValue(true)
                            .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
            // 1.4.3.存储
            String tokenKey = LOGIN_USER_KEY + token;
            stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
            // 1.4.4.设置token有效期

            stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
            // 返回token
            return Result.ok(token);
        }

        // 2.1.使用手机号+密码登录
        if (StringUtils.isNotBlank(loginForm.getPassword())) {
            // 2.2.取出session中的用户密码
            String cachePassword = session.getAttribute("password").toString();
            if (!loginForm.getPassword().equals(cachePassword)) {
                return Result.fail("密码错误");
            }
            User user = this.query().eq("phone", phone).eq("password", cachePassword).one();
            if (user == null) {
                return Result.fail("该用户不存在");
            }
            session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
            return Result.ok();
        }

        return Result.fail("err");
    }

    @Override
    public Result logOut() {
        UserHolder.removeUser();
        return Result.ok("退出登录");
    }


    @Override
    public Result sign() {
        // 获取用户
        Long userId = UserHolder.getUser().getId();
        // 获取日期
        LocalDateTime now = LocalDateTime.now();
        String date = now.format(DateTimeFormatter.ofPattern(":yyyy:MM"));
        int dayOfMonth = now.getDayOfMonth();
        // 获取key
        String key = RedisConstants.USER_SIGN_KEY + userId + date;
        // 签到
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        // 1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy:MM"));
        String key = RedisConstants.USER_SIGN_KEY + userId + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.获取本月截至今天为止的签到记录
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        // 6.循环遍历
        // 如果为0，说明未签到
        // 不为0，已签到
        int count = 0;
        while ((num & 1) != 0) {
            // 和1做与运算 得到最后一个bit位
            count++;
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        // 1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));

        // 2.保存用户
        this.save(user);
        return user;
    }


}
